Originally Posted by jimthesail
Checked terminal and sealed OK so dismissed suggestion ! But, lo and behold, when I extracted battery to clean and charge found alternator
pulley had gouged a neat hole in centre top corner. Suspect vapour forms an external battery in the atmosphere and produces the growth which is soft and furry ! Problem solved
, I hope ?
It means you got acid vapor over parts
like the pulley, belt etc. Wash that with some baking soda and water
, then rinse well. I often dry metal parts
with heat gun and wd40 (which is biodegradable) then buff with clean microfiber cloth